650level problem.Subtle!!

[dddanny2006]

The professor predicts that as students become more and more dependent on coaching classes in the coming years, coaching institutes have been mushrooming across the country.

A)coaching institutes have been mushrooming across the country
B)coaching institutes will mushroom
C)coaching institutes are mushrooming
D)coaching institutes should mushroom
E)coaching institutes will be mushrooming

OA: B

Please explain this problem.
I came down to two options B and E.And cant decide between the two,both seem to be right.In one way as the dependancy increases the coaching institutes will mushroom or as the dependancy increases the coaching institutes will be mushrooming(continued action)

Please clarify.

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Hi dddanny2006,

You correctly deduced that this SC is describing a future event (the phrase "as students become more and more dependent" gives us a number of clues as to what the next verb will be); now we have to use that information and utilize the following grammar rules:

1) The sentence describes something that will happen IN THE FUTURE, so we need a future tense verb. The word "will" works perfectly. Eliminate A, C and D.

2) The verb "dependent" requires a parallel verb to match. Between "mushroom" and "be mushrooming", we need "mushroom." Eliminate E.

Final Answer: B

GMAT assassins aren't born, they're made,
Rich